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This European Standard specifies the characteristics and performance requirements of autoclaved aerated concrete (AAC) masonry units for which the main intended uses are different types of loadbearing and non-loadbearing applications in all forms of walling including single leaf, cavity, partitions, retaining, basement and general use below ground level, including walling for fire protection, thermal insulation, sound insulation and chimneys. It defines the performance related to strength, density, dimensional accuracy, thermal conductivity, moisture movement and it also gives guidance on freeze/thaw resistance according to the corresponding test methods contained in separate European Standards. It provides for the evaluation of conformity of the product to this European Standard. The marking requirement for products covered by this European standard is included. This European standard does not cover the requirements for storey height panels, flue linings and masonry units with an incorporated thermal insulating material bonded to the faces of the unit. It does not specify standard sizes for autoclaved aerated concrete units nor standard work dimensions and angles of specially shaped and accessory units. It does not give permissible deviations for specially shaped and accessory units. It does not cover products intended for use as a dpc.